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arXiv · 2303.01897

Spin alignment of vector mesons from quark dynamics in a rotating medium

Minghua Wei·Mei Huang
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Abstract

Vorticities in heavy-ion collisions (HICs) are supposed to induce spin alignment and polarization phenomena of quarks and mesons. In this work, we analyze the spin alignment of vector mesons $ϕ$ and $ρ$ induced by rotation from quark dynamics in the framework of the Nambu-Jona-Lasinio (NJL) model. The rotating angular velocity induces mass splitting of spin components for vector $ϕ,ρ$ mesons $M_{ϕ,ρ}(Ω)\simeq M_{ϕ,ρ}(Ω=0)-s_{z}Ω$. This behavior contributes to the spin alignment of vector mesons $ϕ,ρ$ in an equilibrium medium and naturally explains the negative deviation of $ρ_{00}-1/3$ for vector mesons. Incidentally, the positive deviation of $ρ_{00}-1/3$ under the magnetic field can also be easily understood from quark dynamics.

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Minghua Wei, Mei Huang. 2026-08-01. Spin alignment of vector mesons from quark dynamics in a rotating medium. https://doi.org/10.1088/1674-1137%2Facf036

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